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Active Control of Structural Vibration

  • Stephen J. Elliott
Part of the Solid Mechanics and its Applications book series (SMIA, volume 130)

Abstract

In its most general form, active control can be used to arbitrarily modify the vibration response of a structure, although in engineering applications the objective is normally to attenuate the vibration. Many actuators and sensors are required to control the vibrations of a large structure, and conventionally these are connected using a single centralised controller, designed using a detailed model of the structure. Very selective control is possible using this approach, which can, for example, modify some modes with little effect on others. However such centralised controllers may not be stable if the response of the structure changes or individual transducers fail, and can become very complicated as the structure becomes large. An alternative approach is to use multiple local control loops in a decentralised arrangement. With careful choice of the actuators and sensors, these loops are simple to design and can be guaranteed stable even if the structural response of the system changes or some transducers fail. Each actuator, sensor and controller can be constructed as a self-contained module, and although the resulting vibration control is not selective such a decentralised system can perform almost as well as a centralised system in reducing the global response of the structure.

Decentralised control for vibration isolation with multiple active mounts will be discussed in this paper as an example of an engineering structure, and this will be contrasted with the way that decentralised control loops enhance the vibration of the inner ear in the active hearing mechanism.

Key words

active control isolation decentralised control active hearing 

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Copyright information

© Springer 2005

Authors and Affiliations

  • Stephen J. Elliott
    • 1
  1. 1.Institute of Sound and Vibration ResearchUniversity of SouthamptonHighfield, SouthamptonUK

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